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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 4
31.
Lines of magnetic field cannot intersect.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.

Assertion (A): Dielectric losses are proportional to tan δ.

Reason (R): tan δ = where ∈r' and ∈r" denote the real and imaginary parts of ∈r.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
At T = 0, the resistivity of a perfect single crystal of a metal is
0
low
high
finite
Answer: Option
Explanation:

At absolute zero temperature resistivity of metals is zero.

34.
In a polyatomic gas, the types of polarization which exist together are
electronic and orientational
electronic and ionic
ionic and orientational
electronic, orientational and ionic
Answer: Option
Explanation:

All the three types of polarization exist in polyatomic gases.

35.

Assertion (A): Metals are better heat conductors than insulators.

Reason (R): If is temperature gradient, Q is heat flow density and K is thermal conductivity, then Q = - K (dT/dx).

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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